node-appwrite 23.1.0 ships a bundled undici Agent via node-fetch-native-with-agent.
That bundle uses an older undici dispatcher API that crashes on Node 26 with
'invalid onError method' (UND_ERR_INVALID_ARG), making every Appwrite call
fail with 'fetch failed' / our user-facing 'Bağlantı hatası' fallback.
The patch replaces createAgent/createFetch with thin pass-throughs to
globalThis.fetch — Node native fetch handles HTTPS to db.kovaksoft.com
directly, no proxy/agent customization needed. Verified end-to-end via
users.listMemberships against the live project.
Also added dev-mode error surfacing in appwriteError so future SDK
exceptions show the real message instead of 'Bağlantı hatası'.
kovakmedya